BROWN THRASHER

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Brown Thrasher
Copyright © 2005 Eric Secker

 Conservation Concern: 5PIF

Population Trend: Stable?
Credibility: Moderate

The Brown Thrasher is a common statewide breeder.  Preferred habitats include shrublands and dense forest edges.  Short term trends seem to indicate that this species is stable in the CW Region; however, long term trends seem to show a slight decline.

Trend Level

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1997-2004 Trend
 Point Count Data		 1988-2004 Trend*
 All Observation Types

*Data gathered using a assortment of sampling methods  - for casual inferences only
  Avg. Yearly
Rate of Change:

The vertical axis numbers represent an index of the population change.

Note that the scales may vary between graphs.

 Avg. Yearly
Rate of Change*:		  
  0%   -1%  
   
   

 

 

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 158

Sample Size (Records): 118

 

AVG. YEARLY RATE OF CHANGE:
(including standard error)
-16 to 17

  GOODNESS OF FIT:
Chi-square: 239.59, df 209, p 0.072
Likelihood Ratio: 223.12, df 209, p 0.2394
AIC: -194.88
NOTE: (model fits if p values are above 0.05)

Download Table of All Observations

 
 

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Copyright © 2005 Audubon - Chicago Region & Bird Conservation Network

 
 
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